To write an essay introduction, open with a hook that earns attention, give the context your reader needs, then end with a thesis that states your argument. Those three moves work for almost every academic essay.
This guide explains each part, how long an introduction should be, when to write it, worked examples for different essay types and the openings markers see too often.
The Three Parts of a Strong Introduction
- Hook: one or two sentences that make the reader want to continue.
- Context: the background, key terms or debate the reader needs.
- Thesis: your main claim, usually the last sentence, sometimes with a preview of your points.
Keep it to roughly 10 percent of the essay, and rewrite it once the body is finished.
What an Introduction Has to Do
An introduction is a promise. It tells the reader what question you are answering, why it matters and what you will argue. A reader who finishes it should be able to predict the shape of the essay.
It does not need to be dramatic or clever. In academic writing, clarity beats flourish. A plain, precise opening that frames the question well scores better than a grand one that wanders.
Part 1: The Hook
The hook is your first sentence or two. Its job is to make the topic feel specific and worth reading about. Choose a type that suits your subject and level.
| Hook type | Example | Works well for |
|---|---|---|
| Surprising fact | Every December and May, campus counselling services see a surge in students seeking help. | Social science, health |
| Concrete scenario | A nurse finishing a twelve-hour shift has four minutes to hand over six patients. | Nursing, education, business |
| Clear statement of a problem | Most cities now have more cars than parking spaces. | Policy, planning, economics |
| Tension or contradiction | Hamlet is a play about revenge in which the hero spends most of his time not taking it. | Literature, history |
| Striking quotation | A short line from your primary text that captures the issue | Literature, when the quotation is analysed |
Avoid dictionary definitions, sweeping claims about "all of history" and rhetorical questions you never answer. They signal filler rather than thought.
Part 2: Context
After the hook, give the reader just enough background to follow your argument. That might be key facts, a definition of a contested term, the scope of the essay or a short summary of the debate.
- Define terms that your argument depends on, in your own words.
- Narrow the scope: which period, place, text or group you are discussing.
- Name the debate: what scholars or policymakers disagree about.
Context should funnel towards your thesis. If a background sentence would not help a reader understand your claim, cut it or move it into the body.
Part 3: The Thesis
End the introduction with your thesis: a specific, arguable claim that answers the question. In longer essays, a sentence after it can preview the structure.
Thesis: Flexible working raises productivity only when it protects uninterrupted time, so employers should judge policies by the focus they create rather than by where staff sit.
Roadmap sentence: This essay first examines evidence on output, then the role of interruptions, and finally the implications for workplace policy.
Our guide on how to write a thesis statement has formulas and examples for every essay type.
Example Introductions by Essay Type
Argumentative Essay
In many cities, a bus ticket now costs more than the fuel for the same journey by car. That price gap pushes lower-income residents towards older, more polluting vehicles or cuts them off from work altogether. Some cities have responded by making public transport free at the point of use. Free public transport is worth its cost because it reduces congestion, emissions and inequality at once, benefits that targeted discounts cannot match.
Analytical Essay
Animal Farm is often read as a satire of one revolution. Yet Orwell gives his sharpest attention not to the pigs who seize power but to the horses who sustain it. Boxer's loyalty, admirable at first, becomes the engine of his own exploitation. By tracing how Orwell's portrayal of the horses changes, this essay argues that the novel warns less about a particular regime than about the loyalty on which every regime depends.
Cause and Effect Essay
Exam stress among first-year students peaks at the same points every year. Exams alone do not explain why the peak is sharpest in the first year. This essay argues that unfamiliar assessment formats, disrupted sleep and financial pressure drive that stress, with sleep loss amplifying the other two.
Each example moves from a specific opening to the context that matters, then lands on a thesis that the body can prove.
Before and After: Fixing a Weak Introduction
Most weak introductions have the right ingredients in the wrong proportions: too much general background and too little claim. Here is one revised step by step.
Before: Technology is everywhere in today's world. Since the invention of the computer, technology has changed how we live, work and learn. Many people have different opinions about technology in schools. This essay will discuss the advantages and disadvantages of tablets in classrooms.
After: Imagine a school that replaces every textbook with a tablet, only to find reading scores flat a year later and repair bills rising. The scenario is a familiar one: schools often buy technology before deciding what it is for. Tablets improve learning only when they replace a specific task, such as practice quizzes with instant feedback, rather than simply digitising the textbook.
The revised version drops the generic opening, uses a concrete scenario as the hook, gives one sentence of context and ends with an arguable thesis. It is shorter and does more.
- Cut every sentence that could open an essay on any topic.
- Replace "This essay will discuss" with the claim itself.
- Check that the hook and the thesis are about the same thing.
How Long Should an Introduction Be?
A common guide is about 10 percent of the total word count. Adjust for the type of essay and your tutor's expectations.
| Essay length | Typical introduction |
|---|---|
| 500 words | One short paragraph, 50 to 70 words |
| 1,000 words | One paragraph, around 100 words |
| 2,000 words | One or two paragraphs, around 200 words |
| 5,000 words | Two or three paragraphs, 400 to 500 words, often with a roadmap |
When to Write the Introduction
Many writers draft the introduction last, or at least rewrite it last. Your argument often sharpens while you write the body, and an introduction written first can promise something the essay no longer delivers.
- Write a working thesis before you draft.
- Draft the body paragraphs.
- Write or rewrite the introduction so it matches what the body argues.
- Check the conclusion answers the question the introduction posed.
Common Introduction Mistakes
| Mistake | Fix |
|---|---|
| "Since the dawn of time..." | Open with something specific to your topic |
| A dictionary definition | Define the term in your own words, only if it matters to your argument |
| Too much background | Keep only context that leads to your thesis |
| Thesis buried mid-paragraph | Put it at the end of the introduction |
| Announcing instead of arguing | Replace "This essay will discuss" with your actual claim |
| Unanswered rhetorical questions | Answer the question in your thesis |
Introduction Checklist
- The first sentence is specific to the topic.
- Key terms and scope are clear.
- The thesis answers the exact question and is arguable.
- The length fits the essay.
- It matches what the body actually argues.
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Frequently Asked Questions
About 10 percent of the essay is a useful guide: around 100 words for a 1,000-word essay and around 200 for a 2,000-word one.
Draft a working thesis first, but write or rewrite the introduction last so it matches the argument in your body paragraphs.
You can, but answer it in your thesis. A question left hanging makes the introduction feel unfinished.
Usually at the end of the introduction, after the hook and context.
In longer essays, a sentence previewing the main sections helps. In short essays, a clear thesis is usually enough.
Yes, if it is short, relevant and you explain why it matters. Avoid famous quotations that have little to do with your argument.
Start with something specific to your topic, such as a concrete case, a precise figure or a real tension, and cut generic sentences about society or history.
Usually only a striking fact in the hook. Save detailed evidence and citations for the body.